Provenance and tectonic setting of sandstones of the Lomas Coloradas Formation,Cabullona Group,Sonora,México:Constraints on petrography and geochemistry

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外文摘要：The sedimentary rocks of the Cabullona Group are well exposed in the Cabullona Basin of northeastern Sonora,México,which represent syntectonic sedimentation associated with Laramide-style deformation during the Campanian-early Maastrichtian.The sandstones of the Lomas Coloradas Formation deposited at the upper part of the Cabullona Group.Petrography and geochemical(major,trace,and rare earth elements)studies were carried out on the sandstones to interpret the palaeoweathering,provenance,and tectonic setting of the Lomas Coloradas Formation sandstones.Most of the sandstone modal analysis data plotted in the QFL and QmFLt ternary diagrams fall into the fields of dissected arcs and recycled orogens,respectively.Geochemically the sandstones are classified as litharenites while few samples plot into the arkosic field.The chondrite-normalized REE diagrams for sandstones have LREE-enriched,relatively flat HREE patterns with negative Eu anomalies.CIA values and the A-CN-K diagram indicate a low intensity of chemical weathering in the source area.The tectonic setting diagram suggests both arc and rift settings for the studied sandstones.The bivariate and ternary diagrams and elemental ratios suggest a felsic source for the Lomas Coloradas Formation.The average REE patterns of the studied sandstones are comparable with REE patterns of the granite from the Caborca block,the rhyolite and granite of the Tarahumara Formation,and the Mesozoic felsic volcanic rocks.The modeled mixture of 40％Proterozoic granite,30％Triassic arc,10％Jurassic arc,and 20％Laramide arc represents the probable source rocks for the Lomas Coloradas Formation.

外文关键词：

ProvenancePetrographyGeochemistryLomas Coloradas FormationCabullona GroupMéxico

作者：

J.Madhavaraju、D.G.Noriega-Montoya、E.Ramirez-Montoya、C.M.González-León、John S.Armstrong-Altrin

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作者单位：

Estación Regional del Noroeste,Instituto de Geología,Universidad Nacional Autónoma de México,Hermosillo,Sonora 83000,México

Ingeniería en Geociencias,Universidad Estatal de Sonora,Hermosillo,Sonora,México

Posgrado en Ciencias de la Tierra,Estación Regional del Noroeste,Instituto de Geología,Universidad Nacional Autónoma de México,Hermosillo,Sonora 83000,México

Universidad Nacional Autónoma de México,Instituto de Ciencias del Mar y Limnología,Unidad de Procesos Oceánicos y Costeros,Ciudad Universitaria,Ciudad de México 04510,México

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出版年：

2024

DOI：

10.1016/j.jop.2024.07.005

古地理学报(英文版)

影响因子：0.186

ISSN：

年,卷(期)：2024.13(4)